Acyl hydrazine derivatives of bis(4-dimethylaminophenyl) methane and process



2,%,388 Patented Aug. 18, 1959 2,900,388 ACYL HYDRAZINE DERHVATIVES F BISM- DIIVIETHYLAIVHNOPHENYL) NHETHANE AND PROCESS Jack M. Tien, Mount Vernon, N.Y.

No Drawing. Application August 8, 1957 Serial No. 677,165

28 Claims. (Cl. 260-495) wherein COR is an organic carboxylic acid acyl group and R is a monovalent radical, defined later herein, selected from the group consisting of alkyl, phenyl, substituted phenyl, naphthyl, halogen substituted naphthyl, pyridyl, substituted pyridyl, pyrimidyl, thienyl, substituted thienyl, furyl, and substituted furyl.

The present application is a continuation-in-part of my copending applications Serial No. 670,644, filed July 9, 1957, now abandoned, and Serial No. 562,795, filed February 1, 1956, and is particularly directed to the process for manufacturing the novel compounds as defined hereinabove and to the novel compounds themselves.

The new coloring matters are essentially colorless in their normal state, yet are capable of generating color immediately upon being brought into intimate contact with a color initiator such as hydrated aluminum silicate, clay, and phenols. The contact may be achieved by the use of solvents; and by the use of pressure or heat with or without solvents.

The novel compounds of my invention are cheap to manufacture, stable in storage and in handling, and useful as a principal source of the colorless form of a coloring agent for duplication processes, such as carbon paper, manifold or pressure sensitive paper, heat sensitive paper, master sheets for hectograph printing, ink for stenciling, typewriter ribbon, and finger and foot printing and the like.

One way to manufacture my compounds involves reaction of the selected acid hydrazide with Michlers Hydrol, which is bis(4-dimethylaminophenyl)methanol, suitably in polar solvents such as methanol ethanol, and dioxane according to the equation:

group such as any C to C alkyl group of which examples are lauryl, myristyl, palmityl, and stearyl; phenyl, and substituted phenyl of the formula such as dichlorophenyl, chloro-nitrophenyl, and 4meth oxyphenyl; pyridyl and substituted pyridyl of the formula X4 X3 such as 2,6-dichloro-4pyridyl, 2,6-dihydroxy-4-pyndyl and tetrachloro-4-pyridyl; thienyl and substituted thienyl of the formula X, X, UXS

such as chloro-2-thienyl, chloro-nitro-Z-thienyl and methy1-2-thienyl; naphthyl and halogen substituted naphthyl; pyrirnidyl and furyl and substituted furyl of the formula XiUXZ 0 such as nitro2-fury1, chloro-Z-furyl and methyl-2-furyl; and X to X are hydrogen, halogen, hydroxy, lower alkyl,

lower alkoxy, and nitro monovalent radicals.

NHNH:

wherein R stands for a monovalent radical of lower alkyl group.

Wide variation in reaction conditions is permissible. Thus, the reaction may be carried out either in the presence or absence of solvent. The reaction temperature may be varied from the room temperature to about C. While it is advantageous to employ stoichiometric amounts of reactants, either one may be present in excess.

Another way to manufacture my compounds is by reaction, in pyridine, of an acid halide with the bis(4- dimethylaminophenyl)methylhydrazine, which in turn is made by reducing the monohydrazone of 4,4-bis(dimethylamino)benzophenone, known as Michlers Ketone or by condensation of Michlers Hydrol with hydrazine according to the equation:

wherein X is a radical of halogen group.

. its uses.

ROOOR NNH,

I V V 7 reduction I r 1 R .7 l J (caemcfmonew- NHNHO=O wherein R, R and X are defined hereinabove.

This invention also includes the preparation of the halogenated benzoic acid hydrazides which are valuable as one parent component for production of my novel compounds as defined hereinabove.

Halogenated benzoic acid hydrazides are readily prepared by reaction of hydrazine with halogenated benzoic acid halides or the esters of halogenated benzoic acids which may be made either by halogenating the ester of benzoic acid or by -halogenating the benzoyl halide followed by esterification. Thus, the chlorinated ethyl benzoate may be prepared by bubbling chlorine into benzoyl chloride containing one percent catalyst such as iron, aluminum, iodine or their mixture at 50 to 60 C. until the increase in weight of chlorine indicates the desired reaction is complete. After purification by fractional distillation or removal of free chlorine and hydrogen chloride by suction, the chlorinated benzoyl chloride can be converted into ethyl ester by refluxing with ethanol. The corresponding hydrazide may be obtained by treatment of the resulting ethyl ester with hydrazine in a suitable solvent, usually methanol or ethanol.

I have accurately defined my invention, its scope, and Now I shall proceed to illustrate but not limit my invention by the following detailed examples:

EXAMPLE 1 1-bis(4-dimethylaminophenyl) methyI-Z-benzoylhydrazine posits a dark semisolid, which is filtered and decolorized I with activated charcoal in boiling benzene solution. The' crude product which precipitates an addition of petroleum ether is collected, redissolved in hot benzene, and diluted with petroleum ether. On cooling, colorless prisms, M.P. 142 to 146 C., are obtained. Analysis.'Calc. for C24H23N401 C, H, N, 14.44. Found: C, 74.10; H, 7.00; N, 14.62. 1

Replacement of benzoic acid hydrozide by ethyl benzoate and of Michlers Hydrol by bis(4-dimethylamino- V phenyl)methylhydrazine in the theoretical portions pro- This colorless crystalline mate duces the same result. rial may also be produced by refluxing a 1:1.1 mixture of bis(4-dimethylaminophenyl)methylhydrazine and benzoyl chloride in pyridine or by reduction of the hydrazone prepared from Michlers Ketone and benzoic acid 4 or ethyl benzoate. The product may be isolated in the usual manner.

EXAMPLE 2 1-bis(4-dimethylaminophenyl)methyl-2-(3-nitr0benzoyl) hydrazine To a solution of 3.6 g. 3-nitrobenzoic acid hydrazide in 60 ml. absolute ethanol is added 6 g. Michlers Hydrol. The resulting mixture is heated under reflux for three hours. The dark precipitate which forms on cooling is separated by filtration. The crude product is recrystallized from hot benzene with the use of activated carbon to yield tiny light orange-yellow needles, M.P. 139 to 144- C. Analysis.Calc. for C24H21N503I C, H, 6.28; N, 16.20. 'Found: C, 66.40; H, 6.10; N, 16.40.

The para isomer which may bev prepared in the same way with the same molecular'proportions of reagents also is a light orange-yellow crystalline material, as are the 2-chloro-5-nitro and 4-chloro-3-nitrobenzoylhydrazines.

It is to be understood the designation, colorless or color-free, is taken to include a light orange-yellow color, since so small amount of the crystalline substance in the solvent orcarrier for making the coloring agent is substantially colorless.

EXAMPLE 3 1 -bi s 4 -dimctizylaminophenyl methyl-2-ison icotinoylhydrazine 3.5 g. isonicotinic acid hydrazide and 6.8 g. Michlers Hydrol in ml. absolute ethanol are heated under reflux for about four hours. After cooling, the precipitate is filtered, dissolved in hot benzene, and decolorized with activated charcoal. From the hot filtrate small sparkling colorless cubic crystals separate rapidly, M.P. to 182 C. Analysis..Calc. for C H N O: C, 70.92; H, 6.99; N, 17.98. Found: C, 70.70; H, 6.80; N,

The isonicotinic .acid hydrazide maybe replaced by one of the following compounds: the hydrazide of nicotinic acid, 2-picolinic acid, tetrachlor'oisonicotinic acid, 2,6-dichl0roisonicotinic' acid, 2,6-dihydroxyisonicotinic acid, and 2,6-dihydroxy-3,S dichloroisonicOtinic acid in the same mole proportions. Each of the products is a colorless crystalline material. Similarly, 1-bis(4-dimethylaminophenyl)methyl-Z-stearoylhydrazine, 1-bis(4-dimethylaminophenyl)methyl-2-palmitoylhydrazine, or 1-bis(4- dimethylaminophenyl)methyl-2-myristoylhydrazine is obtained as white crystalline substance by replacing isonicotinic acid hydrazide with the hydrazide of stearic, palmitic or myristic acid respectively.

EXAMPLE 4 A. Intermediate 2,4-aichlorobcnzoic acia' hydrazide is performed with cooling.

B. 1-bis(4-dimethylaminophenyllmethyI-ZXZfl-dichZora benzoyl) hydrazine A mixture of 3.4 g. 2,4-dichlorobenzoic acid hydrazide and 4.8 g. Michlers Hydrol in 50 ml. ethanol is heated under reflux for about 4 hours. After stripping off most of the solvent, the crude product which separates on cooling is collected, dissolved in hot benzene and treated with clay or activated carbon. The addition of petroleum ether to the benzene filtrate produces an almost white precipitate which is recrystallized from hot benzene, yielding colorless prisms, M.P. 161 to 163 C. Analysis. C316. for C24H26N4OC12: C, H, N, Found: C, 63.50; H, 5.40; N, 12.60.

The 2,3-; 2,5-; 2,6-; 3,4-; or 3,5-dichloroisomer may be prepared as a colorless crystalline substance through the same process.

EXAMPLE 5 A. Intermediate mixed dichlorobenzoic acid hydrazide Chlorine is passed into 5.6 g. benzoyl chloride containing 0.04 g. of fine iron powder and 0.02 g. of iodine at 50 to 60 C. until there is an increase in weight of 3.2 g. After removal of the free chlorine and hydrogen chloride by sucking air through the mixture, the net increase in weight is reduced to 2.8 g., which corresponds to the theoretical quantity. While the crude dichlorobenzoyl chloride may be used to prepare the corresponding hydrazides by direct treatment with hydrazine, it is advantageous first to esterify it by refluxing the crude material for one hour with 25 ml. absolute ethanol and 4 ml. pyridine. After removal of ethanol by evaporation, the oily residue is washed thoroughly with water to re move pyridine and any chlorides and is heated under refiuX for two to three hours with three m1. anhydrous hydrazine in 25 ml. ethanol. The resulting solution is poured with stirring into a large volume of water. The white solid, M.P. 135 to 166 C. is collected.

B. I-bis(4-dimethylamin0phenyl) methyl-Z-dichlorobenzoylhydrazine The same procedure as in example 43 then produces a white solid which melts from 138 to 163 C. This white material may also be made by condensing the ethyl dichlorobenzoate and bis (4-dimethylaminophenyl)methylhydrazine in ethanol.

What is claimed is:

1. A compound having the structural formula NHNH-A CYL ILHNHOOQ 3. A compound having the structural formula 4. 1-bis(4 dimethylaminophenyl)methyl-2-(3,4-dichlorobenzoyl)hydrazine.

5. 1 bis(4-dimethylaminophenyl) methyl-Z-(monochlorobenzoyl)hydrazine.

6. l-bis(4 dimethylaminophenyl)methyl-Z-mononitrobenzoylhydrazine'. v

7. I-bis(4-dimethylaminophenyl)methyl-2-(p-nitrobenzoyDhydrazine.

8. l-bis(4-dimethylaminophenyl)methyl-Z-(m-nitrobenzoyl hydrazine.

9. A compound having the structural formula 01 A compound having the structural formula NHNHC O A compound having the structural formula A compound having the structural formula A compound having the structural formula H (0 0zN N( a)i 14. A compound having the structural formula ILHNHCOQ 01 on 15. A compound having the structural formula (OHQMQCQMCIM Cl (ill NHNH C O comprises reacting the bis(4-dimethylaminophenyl)methanol with dichlorobenzoic acid hydrazide. j I

r 19. A process for the production of 1-bis(4-dimethy1- aminophenyl) methyl-2-(2,4-dichlorobenzoyl)hydrazine which comprises reacting the bis(4-dimethylaminophenyl) methanol with 2,4-dich1orobenzoic acid hydrazide.

20. A process for the production of 1-bis(4-dimethylaminophenyl) methyl2-(3,4-dich1orobenzoy1)hydrazine which comprises reacting the bis(4-dimethylaminophenyl) methanol with 3,4-dichlorobenzoic acid hydrazide 21. Process for preparing 1'-bis(4-dirnethylarninophenyl)methyl-2-aroylhydrazine which comprises reacting the bis(4-dimethylaminophenyl)methanol with an aromatic monocarboxylic acid hydrazide.

22. Process for preparing 1 bis(4 dimethylaminopheny1)methyl 2 halogenated benzoylhydrazine which comprises reacting bis(4-dimethylaminophenyl)methanol with a halobenzoic acid hydrazide. V

23. Process for preparing 1-bis(4-dimethylaminophenyl)methyl 2 monochlorobenzoylhydrazine which comprises reacting bis(4-dimethylaminophenyi)methanol with a monochlorobenzoic acid hydrazide.

24. Process for preparing 1 -bis(4 -dirnethylaminophenyl)methyl-2-nitrobenzoylhydrazine which comprises reacting bis(4-dimethylaminophenyl)methanol with a ni trobenzoic acid hydrazide.

25. Process 'for preparing 1-bis(4-'dimesthylaminophenyl)methyl-Z-(3-nitrobenzoyl)hydrazine which com prises reacting bis(4 dimethylaminophenyl) methanol with m-nitrobenzoic acid hydrazide.

' References Cited in the file of this patent UNITED STATES PATENTS 2,714,595 Bernstein et a1. Aug. 2,1955- 2,746,968 Hegedus May 22, 1956 2,810,725 Bernstein Oct. 22, 1957 i FOREIGN PATENTS 7 106,721 Germany Oct. 26, 1899 116,352 Germany Nov. 27, 1900 116,566 Germany Dec. 3, 1900 729,348 Great Britain May 4, 1955 OTHER REFERENCES Mohlau et al.: Ber. Dent. Chem, vol. 35, pp. 365-6 (1902).

UNITED STATES PATENT OFFICE Certificate of Correction Patent No. 2,900,388

August 18, 1959 Jack M. Tien It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction and that the said Letters Patent h ld read as corrected below. 7 V 7 Column 1, lines 15 to 20, the formula should appear as shown below instead of as in the patent:

NHNHO=0 T A line 51, after methanol insert a comma; column 2, lines 4 to 7, the formula should appear as shown below instead of as in the patent:

X4X3 lines 58 to 59, right-hand portion of the structural formula, for

reduction reduction N (C Hz) a column 3, lines 15 to 18, for that portion of the formula reading l TNHC=O read 1 INHc=o t 5 line 60, for an addition read on addition; line 66, for hydrozide read hydrazide-.

Signed and sealed this 18th day of October 1960.

Attest: KARL H. AXLINE, ROBERT C. WATSON, Attestz'ng Oficer. Gonwm'ssz'oner of Patents.

UNITED STATES PATENT OFFICE Certificate of Correction Patent No. 2,900,388 August 18, 1959 Jack M. Tien It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 1, lines 15 to 20, the formula should appear as shown below instead of as in the patent:

i (CHIMNQTQNWHO:

line 51, after methanol insert a comma; column 2, lines 4 to 7, the formula should appear as shown below instead of as in the patent:

TI X4Xs lines 53 to 59, right-hand portion of the structural formula, for

d t NwH) reduction I8 I10 1011 3 2 read N( Hs)2NHzNH2 NwHmNHNH column 3, lines 15 to 18, for that portion of the formula reading l INHG=O read 1HINHC=O i 1; line 60, for an addition read -on addition; line 66, for hydrozide read hydrazide-.

Signed and sealed this 18th day of October 1960.

Attest:

KARL H. AXLINE, ROBERT C. WATSON, Attestz'ng Ofiaer. Oomnm'ssz'oner of Patents. 

1. A COMPOUND HAVING THE STRUCTURAL FORMULA 